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Just Received a request in my nginx log

77.247.110.141 - - [16/Jun/2019:14:03:58 +0000] "GET //libs/js/iframe.js HTTP/1.1" 200 2305 "-" "python-requests/2.6.0 CPython/2.7.5 Linux/3.10.0-957.12.2.el7.x86_64"

is it a approach to hack into my server?

If affirmative what should be the quickest cure and long term prevention?